M16CSLASH29 datasheet(238/499 Pages) RENESAS

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14. Serial I/O

page 214

Figure 14.31 Transmit and Receive Timing in SIM Mode

D0 D1 D2 D3 D4 D5 D6 D7

PD0 D1 D2 D3 D4 D5 D6 D7

D0 D1 D2 D3 D4 D5 D6 D7

Start

bit

Parity

bit

Set to 0 by an interrupt request acknowledgement or by program

Transfer Clock

Stop

bit

Data is written to

the UART2 register

An "L" signal is applied from the SIM

card due to a parity error

An interrupt routine

detects "H" or "L"

TxD2

Transfer Clock

Read the U2RB register

RxD2 pin Level(2)

TxD2

RxD2 pin Level(1)

Data is transferred from the U2TB

RE bit in U2C1

RI bit in U2C1

IR bit in S2RIC

TE bit in U2C1

TI bit in U2C1

TXEPT bit in U2

C0 register

IR bit in S2TIC

Start

bit

Set to 0 by an interrupt request acknowledgement or by program

Stop

bit

TxD2 outputs "L" due

to a parity error

Parity

bit

(1) Transmit Timing

(2) Receive Timing

Parity Error Signal

returned from

Receiving End

Transmit Waveform

from the

Transmitting End

An interrupt routine detects

"H" or "L"

The above timing diagram applies to the case where data is

transferred in the direct format.

• U2MR register STPS bit = 0 (1 stop bit)

• U2MR register PRY bit = 1 (even)

• U2C0 register UFORM bit = 0 (LSB first)

• U2C1 register U2LCH bit = 0 (no reverse)

• U2C1 register U2IRSCH bit = 1 (transmit is completed)

Tc = 16 (n + 1) / fi or 16 (n + 1) / f EXT

fi : frequency of U2BRG count source (f 1SIO, f2SIO, f8SIO, f32SIO)

fEXT : frequency of U2BRG count source (external clock)

n : value set to U2BRG

The above timing diagram applies to the case where data is

transferred in the direct format.

• U2MR register STPS bit = 0 (1 stop bit)

• U2MR register PRY bit = 1 (even)

• U2C0 register UFORM bit = 0 (LSB first)

• U2C1 register U2LCH bit = 0 (no reverse)

• U2C1 register U2IRSCH bit = 1 (transmit is completed)

Tc = 16 (n + 1) / fi or 16 (n + 1) / f EXT

fi : frequency of U2BRG count source (f 1SIO, f2SIO, f8SIO, f32SIO)

fEXT : frequency of U2BRG count source (external clock)

n : value set to U2BRG

NOTES:

1. Because TxD2 and RxD2 are connected, this is composite waveform consisting of the TxD2 output and the parity error

signal sent back from receiver.

2. Because TxD2 and RxD2 are connected, this is composite waveform consisting of the transmitter's transmit waveform

and the parity error signal received.

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